Possible Clues:

• This horse once concealed Greek warriors bent on breaking a siege
• Hard-working person — coded material inserted to disrupt a computer program
• Mythical horse builder
• What rot to start the year with a long old war
• What rot it could be to have this old person at last for the first month
• For hard work one's a byword, for art? No judge unfortunately
• Hard-working person
• Paris, for example — harmful computer program
• Paris who abducted Helen was such a prince
• ___ horse (hollow wooden statue in Greek myth)